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How do I find the common ratio of a geometric sequence?

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May 18, 2015

The common ratio of a geometric sequence, denoted by #r# , is obtained by dividing a term by its preceding term

considering the below geometric sequence:
#4 , 20 , 100# ...

we can calculate #r# as follows:
1) #20/4 = 5#
2) #100/20 = 5#

so for the above mentioned geometric sequence the common ratio # r = 5#

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